Boring-machine.



. HANSON do. L. GRDHMA-NN.

B.M.W

BORING MACHINE.

APPLICATION FILED JAN-9,1915.

Patented May 9, 1916.

2 SHEETS-SHEET I.

1:11: COLUMBIA PLANDGRAPH C0,, WASHINGTON, D. c

B. M. W. HANSON & C. L. GBOHMANN. BORING MACHINE.

APPLICATION FILED JAN. 9, 195- 1, 182,477. Patented May 9, 1916.

2 SHEETS-SHEET 2.

a may {\AYKL Jrz vs/zyarv M BENGT M. w. HANSON; ANT CARL L. CROHMANN, or HARTFORD, ONNE TICUT, ASSIGNORS To PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A

CORPORATION OF NEW JERSEY.

BORING-MACHINE.

i Applicationfiled January 9, 1915.

To all whom it may concern Be it known that we, BENGT M. WV. HAN- SON and CARL L. GROHMANN, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connectiout, have invented certain new and useful Improvements in Boring-Machines, of which the following is a specification.

This invention relates to boring-machines.

A boring-machine involving our invention can be used with advantage in many different connections; for example the drill constituting a part thereof, can be employed for boring a blank to produce a gun-barrel.

One of the primary purposes of the inven' tion is the provision of simple and effective means for automatically governing operating mechanism through the drill or equivalent tool, the organization being such in the present case, that when the drill is overloaded as it is known, the feed will be automatically arrested.

In the drawings accompanying and forming part of the presentspecifi'cation we have shown in detail one of the several convenient forms of embodiment of the invention which to enable those skilled in the art to practice the same will be set forth fully in the following description. We do not restrict ourselves to this particular disclosure; we may depart therefrom in several respects within the scope of the invention defined by the claims following said description.

Referring to said drawings: Figure 1 is a side elevation of a boring-machine involving our invention, the frame and certain other parts being shown by dotted lines. Fig. 2 is a top plan view of said machine, the frame and said other parts being also shown in dotted lines. Figs. 3 and 4 are transverse sections on the line 3-3 of Fig. 1, the latch being shown respectively in holding and releasing positions. Fig. 5 is a detail view in side elevation ofa rod, a latch carried thereby, part of a belt-shifter and certain coacting devices, the belt shifter being shown in its 'twoextreme positions by full and dotted lines respectively. Fig, 6 is a sectional detail, the section being onthe line 6+6 of Fig, 5 and looking in the direction of the arrow.

Like characters refer to like parts through out the several views,which areon different scales.

Specification of Letters Patent.

Patented May 9, 1916.

Serial No. 1,287.

A machine involving my invention comprises in its make-up, a work-carrier and a drill-carrier, mechanism for relatively causing the two carriers to approach and for also causing relative rotation thereof, and automatic means governed by the tool, which in the present case is in the form of a drill, for arresting said relative motions when the tool or drill is overloaded, which particular condition occurs for instance, when the drill encounters an obstruction. By virtue of this organization the drill cannot become broken or the work ruined.

Referring now more particularly to Figs. 1 and 2, the framingfor supporting the different parts of the machine is denoted in a general way by 2, being shown in the form of a bed and for sake of clearness, dotted. Rising from the bed at one end thereof is the stock or upright 3 constituting a suitable support for the spindle 4 having fastened to its forward or inner end the chuck 5 serving as a convenient work-carrier, the work 6 being held in the chuck by one or more screws as 7. The work in practice is also supported between its ends by a rest which I have not shown as the same is no part of the invention. The spindle or shaft 4 carries at or near its outer end the tightand loose pulleys 8 and 9, the belt 10 being shiftable between the same. It will be clear that if the belt 10 be on the pulley 8, the. latter and hence the spindle 4L, chuck 5 and work 6 will be rotated whereas if the belt be shifted from the pulley 8 to the pulley 9, motion of these parts will be stopped. As will hereinafter appear automatic means is provided for shifting the belt. It will be clear that a radically different kind of work carrier from that described and decidedly different means for actuating the work carrier may be provided,

The drill-carrier is denoted in a general way by 11 and as shown it consists of a slide, the bed being provided with ways on its upper side to receive said slide or carrier 11 for movement toward and from the work carrier 5. In the present instance the drill carrier. or slide 11 receives its motion from the spindle and various means may beprovided for accomplishing this result, Those shown willnow be described. Extending longitudinally of the bed is a feed screw 12 rotary but longitudinally immovable as common in this art. The carrier or slide 11 has bearings for rotatively supporting the shaft 13 equipped with a hand wheel 14, the shaft rigidly carrying the worm gear 15 in mesh with the threaded portion of the feed screw 12. The carrier 11 also supports a clamping member 16 which can be operated by the setting device 17 as quite common in this art. The shaft 13 is rotatively supported by the carrier 11. W'hen the clamping device 16, however, is set, the shaft 13 will be locked against rotation, so that if the screw 12 be turned, said screw by acting against the worm gear 15 also held against rotation, will move the carrier 11 inward or outward in accordance with the direction in which the screw 12 is turned. Through the manipulation of the part 17 the clamping device may be caused to free the shaft 13, so that if the screw 12 be at rest and the hand wheel 14 turned,.the carrier 11 through the shaft 13 and worm gear 15 can be manually adjusted. This is merely one of several ways of operating a drill-carrier and is comparatively common in boring machine art. The same action could be secured in other ways. Extending transversely of the machine and supported by suitable bearings 011 the bed 2 is the shaft 18 having at its inner end the worm gear 19 in mesh with the worm 20 on the work spindle 4. The shaft 18 is provided at its outer end with a pinion 21 in mesh with the spur gear 22 which in turn meshes with the spur gear 23 fastened to the outer end of the shaft 24 provided with a worm 25in mesh with the worm gear 26 on the screw 12. It, there fore, follows that if the worm member 15 be tight with the carrier 11 and that if the belt 10 be on the pulley 8, the spindle 4 will be rotated and the carrier-11 will be fed toward the spindle.

The drill is denoted by 27, being yieldingly and rotatively mounted spring actuated or equivalent means as will hereinafter appear, being provided to hold the drill to its work. Should the drill strike an obstruction, how- 7 ever, it'can rotate and the reason for this will be hereinafter set forth. As shown the shank of the drill is fitted in the holder 28, the screw 29 being provided to rigidly connect said shank with said holder. The holder 28 is provided with a shank 30 mounted for turning movement in the upper portion of the-carrier 11, the shoe 31 inclosed by said carrier, bearing against said shank. Bearing against the shoe is the coiled spring 32' held in place by the screw plug 32 tapped into said carrier 11, the spring acting to constantly urge the'shoe inwardly. It will be clear that on the rotation of the work 6 and the advance of the carrier 11. in the manner described, the drill 27 will form an opening in the work. Should the drill be overloaded it will turn with the work as will also the holder 28, the direction of turning movement being in the direction of the arrow in Fig. 3 for a reason that will hereinafter be ex plained. Owing to the yieldable mounting of the'drill, the latter and the work cannot be injured in case of an overload on the drill.

Supported by suitable bearings on the head or upright 3 is the slidable belt shifting device 33 having a loop or eye 34 to receive the belt 10 the rod on its endwise movement being adapted to move the belt from the pulley 8 to the pulley 9 and vice versa. The rod 33 is moved in one direction by hand and in the other automatically, such for instance as by a spring 35, encircling said rod. Said spring bears at one end against the fixed collar 36 on said rod, and at the other against the fixed bearing 37. The hub or body of the handle 38 is pinned or otherwise suitably fiXed to the rod 33 and is provided with .a projection 39, the function of which will be hereinafter set forth.

In Figs. 1 and 2 the belt 10 is shown as being on the loose pulley 9. To move the belt to the pulley ,8, the rod 33 will be moved toward the right in both views. When the belt is shifted to the pulley 8, the rod 33 will be held positively in its shifted position for instance, by means of a suitable nature engaging the projection 39. When the projection is freed the rod 33 will be released so that the tensioned spring 35 can rapidly move the rod 33 to shift the belt from the pulley 8 to the pulley 9 and thus stop the rotation of the spindle 4 and the advance of the carrier 11. As will hereinafter appear we provide means for automatically stopping the relative motion to which we have hereinbefore alluded when the drill 27 has performed a certain amount of work. For instance, this relative action would be arrested in the case of a gun barrel, when the blank had been entirely drilled. There may be other cases where the relative action would be stopped before a hole is entirely formed through the piece of a work of whatever character the same may be.

Extending longitudinally of the machine and supported by suitable bearings as 40 is the rod 41 mounted in the present case for turning movement and immovable in the direction of its axis. This rod is shown as pivotally carrying near one end thereof, (the left in Figs. 1 and 2,) the latch 42. Fastened to the rod 41 is the collar 43, the collar and body of the latch 42 being slightly separated, and in the space between the two is the coiled spring 44, one end of which bears against the collar 43, and the other end of which bears against the body or sleeve portion of the latch 42, the tendency of the spring being to constantly elevate the detent or holding portion 45 of the latch and hence to maintain the lug 46 of the latch against the lug 47 (see Fig. 6) of the collar 43. It will be clear that the latch 42 can be operated independently of the rod 41. To shift the belt 10from the loose pulley 9 to the tight or fast pulley 8 involves the moving inward of the rod 33 through the action of the handle 38. To accomplish this motion the detent portion 45 of the latch is lowered and the shifting then accomplished, after which the detent portion 45is released, so that said detent portion will be projected into the path of the projection 39 and, therefore, hold the rod in the position to which it has been shifted. 15y lowering the detent portion 45 with respect to the rod 41, the projection 39 will be released or if the rod 41 be turned in such manner that the lug 47 of the collar 43 as the rod 41 turns will lift the lug 46, the detent portion 45will be lowered. This turning of the rod 41 is automatically effected either at the conclusion of a predetermined operation or when the drill 27 is overloaded. The rod 41 slidingly extends through the bearing 48 of the drill carrier, 11. Said rod is shown as having in its under side the keyway 50 to receive the pin 51 on the hub of the arm 52 rising from the rod 41 from which it will be clear that the arm is slidingly connected with the rod 41. Interposed between the hub of the arm and the bearing 48' is the'coiled torsion spring acting against the arm 52 and bearing 48 respectively, the purpose ofthe spring being at the proper time toswing the arm 52 and through said arm turn the rod 41 and therefore in the manner already described move the detent portion 45 below the projection 39 to release the rod Pivoted between its ends on the forward upper side of the carrier 11 adjacent the drill holder 28, is the latch 54, the shouldered portion of which engages the arm as shown in Fig. 3 to prevent swinging movement of said arm and therefore turning of the rod 41. Adjustably mounted on the rod 41 is the slidable clamping collar or dog56. In Figs. 1, 2 and 8 the latch 54 is shown as occupying its operative position, holding the arm 52 against motion. It will be assumed that the belt 10 is on the pulley 8 and that as a consequence the holder 5 is, lJGlIlg rotated and the carrler l1 advanced.

Just before the conclusion of the boring portion the hub of the arm 52 strikes the adjustable collar 56, so that on the continuation of the advance of the carrier 11 the arm 52 will be arrested, the advance of the carrier continuing until the conclusion of the operation at which point the shouldered or active portion 55 of the latch 54 will be carried free of the arm 52, thus releasing the arm so that it can be swung to the right as shown in Fig. 4 and the rod 41 turned in such manner as to move the detent portion 45 down and release the projection 39 assumed at this time to be,

held. When the projection 39 is released the spring 35 becomes effective through the rod 33 and loop or eye 34 for shifting the belt from the pulley 8 to the pulley 9 and thus stopping the machine.

As previously stated when the drill 27 is overloaded it is caused to rotate with the work, the holder 28 as a consequence also turning. As shown the holder is equipped with a circumferential cam 58, the tall or inner branch of the latch 54 being disposed in the path of this cam or trip portion 58. When, therefore, the holder 28 is rotated the cam or trip portion 58 will trip the latch 54 and disengage its shoulder or holding portion 55 from the upper or free end of the arm 52, thus releasing said arm and hence the rod'4l, so that the rod 41 will be turned to move through the described means the detent portion 45 away from the projection 39 and thus effect also through the parts previously described movement of the belt from the tight pulley 8 to the loose pulley 9.

hat we claim is:

1. In a boring machine, the combination of means for rotating the work, means for normally holding the drill against rotation, means for automatically feeding the drill to the work, a device automatically shiftable to stopthe rotation of the work and the feed of the drill, a turnable rod, a latch shiftable with respect to the rod to engage said device to normally hold the same against shifting movement, means tending constantly to turn the rod, means involving a latch, to hold the rod normally against turning movement, and means for automatically tripping the second latch on rotation of the drill to thereby release the rod, the rod when released acting to trip the first latch to free said device.

2. In a boring machine, the combination of means for rotating the work, means for normally holding the drill against rotation, means for automatically feeding the drill to the work, a device automatically shiftable to stop the rotation of the work and the feed of the drill, means normally holding said device against motion, a rod mounted for turning movement, an arm keyed to said rod, a spring acting against the arm and a fixture respectively and thereby tending constantly to swing the 'arm and therefore turn the rod, a latch for normally holding the arm against movement, means operative with the drill for tripping said latch on the rotation of the drill to thereby permit turning of the rod, and means for releasing said device on the turning of the rod.

3. The combination of means for rotating the work, a slide provided with a drill holder, means on the slide for normally holding the drill against rotation, means for automatically advancing the slide to thereby eifect the feed movement of the drill, a device automatically shiftable to stop the rotation of the work and the advance of the slide, means tending normally to hold said device against shifting movement and comprising an arm supported independently of the slide, a latch on the slide for normally engaging the arm, the slide being advanceable with respect to the arm whereby the latch will pass free of the arm when the slide has made a predetermined movement to thus free the arm and thereby efiect the release of said device, and means operative with the drill for tripping said latch to also free said arm on the rotation of the drill.

4;. In a boring machine, the combination of means for rotating the work, a slide provided with a drill holder, means for normally holding the drill against rotation,

means for advancing said slide to thereby effect the feed movement of the drill, a device'automatically shiftable to stop the rotation of the work and the advance of the slide, a turnable rod provided with an arm keyed thereto for sliding movement, a spring coiled around the'rod and acting against the slide and arm respectively and tending constantly to swing the arm and 7 thus turn said rod, an adjustable collar on the rod in the path of the arm, a latch on the slide for engaging the arm, the slide on its movement carrying the latch free of the arm after the latter has engaged said collar on the advance of the slide to thus free the arm and thereby permit turning of the rod, means operative with the drill for tripping the latch on the rotation of the drill, means for normally preventing movement of said device, and means for freeing said device on turning of the rod.

The combination of a work carrier and a drill carrier, mechanism for relatively'advancing the work and the drill and for relatively rotating the work and the drill, a device automatically shiftable to stop said relative motions, a turnable rod, a latch turnable on the rod, spring means between the rod and the latch for maintaining the latch in position to normally hold said device against shifting movement, means for automatically turning said rod, the latter having means to trip said latch when the rod is turned.

In testimony whereof we afliX' our signatures in presence of two witnesses. 7

BEN GT M. W. HANSON. CARL L. GROHMANN. Vitnesses: V

V]. M. SToRRs, H; E. BAILEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

